Log-loading jack



W. A. ARCHIBALD 0G LOADING JACK Filed Jan. 9, 1923 'Nov. 27, 1923 INVENTOR, I

` ATTORNEY.

Patented Nov. 27, 1923.

WHITNEY A. ARCHIBALD, OF BELLINGHAIVI, IVASH-INGTON.

rioe-Loanive JACK.'

Application filed January 9, *1923. Serial No. 611,580.

To all whom t may concern.'

Be it vknown that I, Wnrrivnr A. ARCHI- BALD, a citizen of the United States, and a` resident of Bellingham, in the county of Whatcom and State of TWashington, haveinvented a new and useful Log-Loading Jack, of which the following isa'speciiication.

My invention relates to improvements in log loading jacks, the kind which are mounted on :a guy cable of a spar treev vertically above the car to be loaded with logs, and one vofthe objects of-myimprovementsis to provide a jack which is clamped to the guy cable by the action of the loads borne thereby .o erating'throu'gh a single lever, and a furt er obj ect of my improvements is to prevent the upward kick of released riggingv strains of operation from reaching the clamp tighteners.

This invention is an improvement on VPatent Number 1,430,717 for 'log loading jack granted to me Oct. 3, 1922, in which two levers coact to transmit the weight ofthe loads to the clamping members, (and also in which long chain links are used to absorb the upward thrust of the lead'pulley due to suddenly released, operative, rigging strains.

I attain these objects with the mechanism illustrated in the accompanying sheet of drawings, which form a part of this speci-g fication, and in which Figure 1 is a front" elevation of mynew jack, Fig. 2 is a side elevation of Fig. 1 and Fig. 3 is a view of my jack in operative position on the guy cable of a spar tree above a car being loaded with logs, drawn on a smaller scale. Simi-- lar characters referto similar parts throughout, and certain parts are broken away 'to rThese plates. are spaced aparta-nd' fastened show others hidden thereby.

More particularly', two side plates 4, 4 con-l n jack to its position on the guy cable. Stop vbolt 24 is fastened in holes in the right-hand stitute the main frame and housing of my jack. In each plate are two slots c, a4, registering with similar slots in the other plate, the purpose of which will be explained later.

together with bolts 7 therethrough and also through channel bar 5 which vcloses the upper part of Ithe housing. In channel bar 5 is bedded hardwood clamp bar 6 'which is also held in'place by said bolts 7 which firmly clamp plates 4 to channel 5. -The lower side of bar 6 is grooved longitudinally at a6. A movable channel bar `8 is'thinner than bar 5 and is placed beneath the same between said plates4 l'and'retained for parallel movements vtherewith by bolts "10, 10

vthrough slots a4. rlhe channels of bars 5 and 8 face each other, and in the channel of bar 8 is hard-wood clamp` bar 9 retained in vplace by said bolts 10 which pass therethrough. In theupper edge of bar 9 is longitudinal groove a9, andy between bars 6 and 9 in grooves a and a? isclamped spartree guy cable A in a mannerto be described. A Vclamping lever 11 is pivoted on bolt 12 through both of plates 4.v In a lslot in the upper and free end of lever 11' is mounted wheel 13 on pin 14 for revolution.

having a hole k15 therethrough the purpose of which will beexplained. On the lower end 'of lever 11fis radial lug 16. Lever arm 17 is 'mounted on bolt 12 for revolution 'in a slot inlever 11 and has a lug 18 to bear against lug 16, before mentioned, when said arm is revolved clockwise, but free to revolve kwith Vpin 20, bears on .channel bar 8 to relieve pin 20from pressure. The free end of cam bar 19 has set screw 21 engaged in -a tapped hole therein toi-bear on the bottom of channel bar 8 and adjust the dist-ance between said channel bar and cam bar. A curved channel22 is 'made in the lower side of cam bar 19 midway of its length eccentric with bolt 12. In this eccentric channel or cam slot wheel 13is mounted to roll therein as lever 11 turns on bolt 12.- Eye 23 is bolted to the left-hand side of plates 4`and lwith it is engaged a block when 'hoisting the side of plates`4 and servesto stop the upward movement of lever'arm 17 as explained. In Fig. 3, spar tree B is guyed by cables A andC- Jack 4 has been placed o-n guy cable A and v drawn to the position shown by means of a linefastened to eye 23 `and riven over hoisting block E fastened to the top o-f the spar tree. Beforel raising j ack 4 to the illustrated position .lead block D was fastened to lever .arm 17 and lever 11 was tied in aposition to theleft of its.v illustrated position with a rope lthrough hole .15 and eye 23".- Thusfthe weight'of block D, which Alis Onthe i left hand edgey of lever 11 is a boss or lug very heavy can not o-perate to clamp bars o and 9 on cab-le A while the jack is being raised to its operative position. When the jack is in place the line with which it was raised is fastened to the spar tree after being removed from block E and the rope holding lever 11 away from cam bar 19 removed. Then hoisting cable G from the hoisting drum of a donkey engine, not shown, is rived over block E and also Vover lead block D and its lower end is fastened to loading tongs F. Then tongs F are: engaged with a log lying in the yar-d on the ground near a logging truck J and the donkey winds in the hoisting' cable which elevates the log while guided by line H. When the log, as I, is in the desired position above truck J the brake is released on the donkey hoisting drum and the log is allowed `to move downward on to the truck. The resultant of hoisting strains on lever arm 17 is about in the direction of the arrow in Fig. 1. And when the first log is raised by cable Gr this resultant forces lever arm 17 as far in a clockwise direction as it is allowed to re volve on bolt 12. Thus lug 18 bears heavily on lug 16 causing lever 11 to revolve in a clockwise direction and forcing wheel 13 forward in cam slot 22. The path of the furthermost point in the periphery of wheel 13 as lever-11 revolves on bolt 12 is indicated in a dotted arc als in Fig. 1. This arc intersects cam slot 22. Thus the clockwise revolution of lever 11 forces cam bar 19 and channel bar 8 and wooden bar 9 toward wooden bar 6 till cable A is firmly bedded in the wooden bars and said cable is clamped between said bars in a manner securely fastening the jack to the cable yet causing no injury thereto. The angle between dotted arcI 0L13 and cam groove 22 is small enough to cause lever 11 to remainy in they position to which it is forced by operative pressures on arm 17 after said pressure ceases. Then after loading the first log the rope tying eye 23 to the spar tree is removed and the jack will remain as set as long as needed in that location. Not

' infrequently the drum brake on the donkey is released suddenly and the great strain on the gear is thereby caused to cease quickly with the result that the gear is forcibly retracted and the heavy block D moves outward with a force that would cause; lever 11 to move in a counter clockwise direction and unclamp t-he ack if arm 17 were rigid with lever 11. But said arm is free to move in a counter clockwise direction on bolt- 12 without carrying lever 11 with it. Thus the reaction movement of block D only causes arm 17 to revolve till it strikes stop bolt 24 which halts it before it can act to move lever 11 out of its clamping position. When it is desired to unclamp the jack from the guy cable, cable G -is disconnected from tongs F and connected to lever 11 in hole 15 and the donkey power applied to pull said .lever out of its clamping position. When this is accomplished the ack is allowed to slide down the guy cable to the ground by slacking off the cable. G. If it should hap-pen that the clamping union between wheel 13 and groove 22A is so diflicult to break that ity can not be readily attained in this way, then a slight unscrew ing o-f screw 21 will release lever l1. As the grooves in wooden clamp blocks 6 and 9 wear deeper the higher position to which channel bar 8 must be forced is provided for by driving screw 21 farther into bar 19.

Having thus disclosed my invention. what I claim as new and desire to secure by Letters Patent is,-

1. In a log loading jack in combination, a ack housing, a cable-clamp member fixed to said housing, a cable-clamp member slidably engaged with said housing adapted to coact with said fixed clamp member to clamp on a cable between them and having a cam surface thereon, and a lever fulcrumed in said housing one end of which bears on said cam surface on said movable-clamp member adapted to force it into closer proximity to said fixed-clamp member when turned on its fulcrum in one direction and the other end of which is connectable to a log the weight of which turns 'said one end in said one direction thereby forcing said movable-clamp member into closer proximity to said fixed clamp member.

2. In a log loading jack in combination, a jack housing, a cable-clamp member fixed to said housing, a cable-clamp member slidably engaged with said housing adapted to coact with said fixed clamp member to clamp on a cable between them, a cam groove member adjustably connected to said slidable clamp member, means adapted to vary the distance between said cam-groove member and said slidable clamp member, and a lever fulcrumed in said housing one end of which bears on said cam groove adapted to force said slidable clamp member into closer proximity to said fixed clamp member when turned on its fulcrum in one direction and the other end of which is connectable to a log the weight of which turns said one end in said one direction whereby said movable clamp member is forced into closer proximity to said fixed clamp member by the action of the said weight of the said log.

3. In a log loading jack in combination` a jack housing,a cable-clamp member fixed to said' housing, a cable-clamp member slidably engaged with said housing adapted to coact with said fixed clamp member to clamp on a cable between them and having a cam surface thereon, and a lever fulcrumed in said housing onone end of which is a *rollery mounted for'revolution adapted to bear on Vjack housing, a cable-clamp member vfixed to said housing, a cable-clamp member slidably engaged with said housing adapted to coaot with said fixed-clamp member to clamp on a cable between them, ia cam-groove member adjustably connected to said slidable clamp member, means adapted to vary thedistance between Asaid `cam-groove member and send,v

slidable clamp member,A and a lever fulcrumed in said housing on one endof which is mounted forrevolution a roller. adapted,

to roll in said cam groove and force said slidable lclamp member `in closer proximity to said fixed clamp memberV when turned on its fulcrum in one direction and the other end of which is connectible to a log whereby the weight of said log turns said one end of said lever in said one direction and forces said slidable clamp member into closer proximity to said fixed clamp member.

5. In a log loading jack in combination, a jack housing, a cable-clamp member fixed to said housing, a cable-clamp member slidably engaged with said housing adapted to coact with said fixed clamp member to clamp on a cable between them and having a cam surface thereon, and a lever fulcrumed in said housing one end of which bears on said cam surface adapted to force said slidable clamp member into closer proximity with said fixed clamp member when turned on its fulcrum in one direction and the other end of which is connectible to a log the weight of which turns said one end to force said slidable clamp member into closer proximity with said fixed clamp member, said lever also having fastening means adapted to connect a tension member thereto wherewith to draw said one end of said lever away from bearing on said cam surface whereby said Islidable clamp member may withdraw from said fixed clamp member.

6. In a log loading jack in combination, a jack housing, a cable-clamp member fixed in said housing, a cable-clampmember slidably engaged with said housing adapted to coact with said fixed clamp member to clamp on a cable between them and having a cam surface thereon, a lever fulorumed in said housing adapted to bear on said cam surface whereby when said lever is turned in one direction said slidable clamp member is forced into closer proximity to said fixed clamp member and said lever having a lug thereon, and a lever arm fulcrumed with `r`said ,lever in said housing ,engageable with ,said lever lug when moved in ,a direction -to turn said lever in said one direction and free from ysaid lug lwhen turned in an opposite direction ,and adapted for connection with;A

,a-log, the weight of which causes it to turn said lever in said onedirecton and the re-l flex forces operable twhen said lever arm is 4 suddenly relieved ojfsaid weight causes said .lever arm to turn in said opposite .direction whereby ysaid lever is not movedby the operation of said refiex forces.

7. In a loglolading ack in combination, a jack housing, a ,cable-clamp memberr fixed in said housing, a Ycable-clamp member slidably engaged with said' housing adapted to coact withsaid fixed clamp member to @lampen ,a cable between them and having a cam surface thereon, a. lever fulcrumed in said housing .adapted to bear onsaid cam surface whereby when, said lever is turned in one direction' said Vslidable clamp member is vforced y into Closer proxiijnity` to said fixed clamp member and said' lever having a lug thereon, a stop on said housing in the path o f movement of a lever arm` and a lever arm fulcrumed with said lever in said hous ing engageable with ksaid lever lug when moved in a direction to turn said lever in said one direction and free from said lug when turned in the opposite direction and adapted for connection with a log the weight of which causes it to turn against said lug and the reflex forces operable when said lever arm is suddenly relieved of said weight causes said lever arm to turn in said opposite direction against said stop whereby said lever is not moved by the operation of said reflex forces.

8.V In a log loading jack in combination, a jack housing, a cable-clamp member fixed to said' housing, a cable-clamp member slidably engaged with said housing adapted to coact with said fixed clamp member to clamp on a cable between them, a cam- 'groove member adjustably connected to said slidable clamp member, means adapted to vary the distance between said cam-groove member and' the clamp member to which it is connected, a lever, having a lug thereon, fulcrumed to said housing one end of which bears on said cam surface adapted to cause said slidable clamp member to approach said fixed clamp member when turned in one direction, said lever having fastening means thereon adapted to connect with a tension member wherewith said lever may be caused to turn in another direction on said cam surface and allow said slidable clamp member to recede from said fixed clamp member, a stop on said housing in the path of movement of a lever arm, a

.lever arm fulcrumed with said lever in said housing engageable Ywith said lever lug when turned in a direction to move said lever in said one direction and free from said lug when moved in an opposite direction and adapted for connection to a log the weight of which causes it to `turn and bear on said lug whereby said clamping members are forced into closer proximity and free from said lug when turned in said opposite direction against said stop by reflex forces operable thereon when said weight is suddenly released whereby said lever is not moved by the operation of said'relex forces. 9. In a log loading jack in combination, a j ack housing, a cable-clamp member fixed to said housing, a cable-clamp member slidably engaged with said housing adapted to coact with said fixed clamp member to clamp on a cable between them, a camgroove member adjustably connected to said slidable clamp member, means adapted to vary the distance between said cam-groove member and said slid-able clamp member, a lever, having a lug thereon, ulcrumed in said housing, a wheel mounted for revolution on one end of said lever adapted to roll in said cam groove and force said slidable clamp member into closer proximity to said fixed clamp member when said one end of said lever is moved' in one direction, a stop in said housing in the path of movement of a lever arm, a lever arm fulcrumed with said lever in said housing engageable with said lever lug when turned in a direction to move said lever in said one direction and free from said lug when moved in the opposite direction and adapted for connection to a log the weight of which causes it to turn and bear on said lever lug whereby said clamping members are forced into closer proximity and free from said lug when turned in said opposite direction against said stop by reflex forces operable when said weight is suddenly released whereby said lever is not moved by the operation of said reflex forces.

WHITNEY A. ARCHIBALD. 

